A Soviet invention is discussed. The invention refers to ceramic materials which can be obtained by methods of powder metallurgy and can be used in high temperature technology

Chechenya, T. V.

Osipova, Y. A.

English

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https://ntrs.nasa.gov/search.jsp?R=19830022384 2020-03-21T03:16:22+00:00Z
T, V. Chechenya and Ye. A. Osipova
U
NASA TECHNICAL MEMORANDUM	 NASA TM-77255
BURDEN FOR MANUFACTURE OF CERAMIC MATERIAL
Translation of "Shikhta dlya izgotovleniya
keramicheskogo materiala", USSR Patent No,
655691, Opisaniye Izobreteniya k Avtorskomu
Svidetel'stvu, (Description of an Invention.
with Author's Certificate), Published in Bulletin
Izobreteniy, No. 13, PIay 5, 1979, 2 pp.
(NASA-TM-77255)	 HUFDEN FOR MRNUFACTU1ic,
 Ur N83-30655
CERAMIC MATERIAL (National Aeronauti cs d"d
Space Atlainistration)	 5 p HC A02 /MF Au 1	 DnclasCS-- " 1 1 B
G3/27 13178
NATIONAL AERONAUITCS AND SPACE ADMINISTRATION
WASHINGTON, D.C. 20546	 MAY 1983
-	 ii
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BURDEN FOR MANUFACTURE OF CERAMIC MATERIAL May 1983
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Translation
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 and Space Administration
Washington, D.Cf
	 40546 IA %m•w" Amt CO&
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Translation of "Shikhta dlya	 izgoto,, Ieniya keramicheskogo materiala",
USSR Patent No. 655691,	 Opisaniye	 Izobreteniya k Avtorskomu
Svidetel'stvu,	 (Description of an	 Invention with Author's	 Certificate),
Published	 in Bulletin	 Izobreteniy, No.	 13, May 5,	 1979,	 2	 pp.
Is. Abe~'	 r
The invention refers to ceramic materials which can be obtained
by methods of powder metallurgy and can be used in high temperature
technology.
17. Roy Set tle
 
(AMM/N BY Avl&"id M. a.Vo1r11•• 699"" W
Unclassified - Unlimited
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	 1
.Unclassified Unclassified 5
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JDescription of Invention for Certificate cf Authorship 655691.
Applied for 01 October 1976, Application No. 2406926/29-33, Published
05 April 1979, Bulletin No. 13, Date of publication 08 April 1979.
M. K1 2 C 04 B 35/56, C 04 B 35/58.	 UDC 066.798.2(088.8).
BURDEN FOR MANUFACTURE OF CERAMIC MATEPIAL
T. V. Chechenya and Ye. A. Osipova
The invention refers to ceramic materials which can be obtained
	 /1*
by methods of powder metallurgy and can be used in high temperature
technology.
There are widel y known ceramic materials, refractory masses
which are used in high temperature technology [1].
The closest to the invention is burden for the manufacture of
ceramic material which contains silicon carbide, chrome alumino-
phosphate binding agent, magnesium oxide and chr,mite.
	
It contains
the indicated ingredients inthe following quantities, percent by
weight:	 silicon carbide 55 - 63, chrome aluminophosphate binding
agent 13 - 17; chromite of fraction less than 0.1 mm 20 - 25; mag-
nesium oxide 3 - 5 [2].
The m, erial has the following physical characteristics:
volumetric weight 2.4 g/cm 3 ; ultimate compression strength (roasting
temperature 1600°C) 6.00 - 7.00 kg/ mm 2 ; gas permeability 0.6 - 0.8
l.m./m 2 hour x wat.col.
The shortcomings of this material are high temperature of
sintering and low mechanical strength.	 This excludes it from being
used as	 structurcl material (for example, material for heat
exchanger frames in gas-turbine engines).
The purpose of the invention is to improve the mechanical
strength of the material.
*
Numbers in margin indicate pagination in original text.
1
ORIGlitiAL F"+ 1 IS
f	 Of POOR QUALITYt
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	 In order to achieve this goal, the burden for manufacture of the
ceramic material which includes silicon carbide, magnesium oxide and
aluminum chrome-phosphate binding agent, also contains silicon
nitride with the following ratios of components, percent by weight:
Silicon carbide	 32.9 - 47.3
Magnesium oxide	 1.3 - 1.5
Aluminum chrome-phosphate binding agent 	 16.4 - 19.7
Silicon nitride	 31.5 - 49.4
The raw material used was: 	 green silicon carbide, silicon
nitride, roasted magnesium, chrome aluminum phosphate binding agent.	 /2
The method of making the material consists of preparing a mass
consisting of powder of silicon carbide and chrome aluminum phosphate
binding agent to which silicon nitride powder and roasted magnesium
are then added.	 All are carefully mixed and directly before molding,
the mass is prepared.
It is molded in steel molds which are chrome-plated on the working
surface- with specific molding pressure of 300 - 1000 kg/cm2.
The intermediate products are sintered according to the
following technology:
Drying from 20° to 150°C for 5 hours in air.
Sintering from 20 to 700°C for 6 hours and holding at 700°C for
one-two hours in air.
The effect of the percentage content of silicon nitride on
the strength of the samples is indicated in the table.
	
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2
As is apparent, the magnitude of strength exceeds the sane
magnitudes of the known ceramic material ( 6 - 7 kg/mm 2 - 11 ). The
items made of the proposed material, in addition, have low sintering
temperature (700°C instead of 1600°C for the known ceramic material).
The technology for manufacturing the items is comparatively simple
and the employed materials are inexpensive.	 The volumetric weight
of the material is about 2.4 g/cm 3 , thermal stability is 1000 - 20°C
of 20 air thermal cycling without destruction.
The proposed ceramic material can be used as structural high-
temperature material, for example for heat exchanger frames of a
gas-turbine engine.
Formula of the Invention
The burden for making the ceramic material which includes
silicon carbide, magnesium oxide and aluminum chrome-phosphate
binding agent is distinguished by the fact that in order to improve
mechanical strength, it additionally contains silicon nitride with
the following component ratio, percent by weight:
Silicon carbide	 32.9 - 47.3
Magnesium oxide	 1.3 - 1.5
Aluminum chroiie-phosphate binding agent 	 16.4 - 19.7
Silicon nitride	 31.5 - 49.4
Sources of information considered in the expert evaluation.
1. USSR Certificate of Authorship No. 348634, k. C 22 c 29/00, 1971.
2. USSR Certificate of Authorship No. 408935, I.1. C 04 v 35/56, 1972.
3


Burden for manufacture of ceramic material

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